No person to whom a permit has been granted shall perform any of the work authorized by such permit in any amount greater than that specified in the permit, except that upon approval by the Service Director, additional work may be done under the provisions of the permit in such an amount as the Director shall deem appropriate and necessary to complete the work. Any deposit and bond posted in connection with the permit shall be deemed to cover any such additional work as may be approved pursuant to this section within the limit mentioned herein.
(1974 Code, § 903.03)